Cutting-stick for paper-cutting machines.



B. M; HELM. CUTTING STICK FOR PAPER CUTTING MACHINES.

Patented May 17, 1910.

APPLICATION IILBD SEPT. 25, 1909.

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BRUCE MONROE HELM, OF HAGERSTOWN, MARYLAND.

Specification of Letters Patent.

CUTTING-STICK FOR PAPER-CUTTING MACHINES.

Patented. May 17, 1910.

Application filed September 25, 1909. Serial No. 519,584.

To all whom it may concern:

Be it known that I, BRUCE M. HELM, a citizen of the United States,residing at Hagerstown, in the county of Washington and State ofMaryland, have invented certain new and useful Improvements inCutting-Sticks for Paper-Cutting Machines, of which the following is aspecification.

This invention relates to the class of cutters and bed-blocks, andpertains especially to sticks employed in guillotine paper cuttingmachines.

The object of the invention is to provide a paper cutting stick havingcertain novel and peculiar construction and arrangement of parts as willlengthen the life of its use, and permit its being operatedexpeditiously.

A further object of the invention is to pro vide, in a paper cuttingstick, a novel and peculiar device for screw clamping an impact striptherein so that such strip may be placed, removed and renewed withoutinjury to the clamps, the clamping screws or the stick.

I am aware that various devices have been employed for holding a cutterstrip or block to the bed of paper cutting machines, certain of suchdevices comprising a plate and screw-bolts extending through the plateand through the strip holder and provided with nuts for clamping thestrip to the holder. The device to be hereinafter described will befound to overcome certain objections and disadvantages of such otherdevices commonly employed.

The invention consists in the novel construction and arrangement ofparts and resides essentially in a series of independent clamping platesthroughout the length of the holder, each of the plates being operatedon the strip by a set-screw.

In the accompanying drawings forming part of this application: Figure 1is a sectional view of a guillotine paper cutter partly broken awayshowing the application of the invention. Fig. 2 is a perspective viewof my cutting stick, partly broken away, in condition to be applied to acutting machine. Fig. 3 is a similar view with the strip and platesremoved. Fig. l is an enlarged cross-section on the line 20-00 Fig. 2.Fig. 5 is a similar view on the line g g Fig. 2. Fig. 6 is a perspectiveview of one of the clamping plates.

The same reference numerals denote the same parts throughout the severalviews of the drawings.

The cutting machine is of the usual guillotine type, having a cuttingblade or knife 1, and a grooved or slotted bed 2 in which is fitted myimproved cutting stick.

The cutting stick consists of a metal holder 3, having an abuting flange4: and a flange 5, between which flanges is formed a space or groove 6,for a cutting strip or wooden bar 7 against which the edge of a knifestrikes in the cutting operation.

The flange 5 has a series of slots 8 through it, and such slots extendthrough this side of the holder 3 so as to form a recess 9 for theclamping plates 10. The clampingplates 10 have a countersunk hole 11 andthey are thinner than the depth of the recesses 9 and the flange 5, .sothat they will set within the outer face of this flange and this face ofthe holder for the purpose of keeping them out of contact with the bed 2when the stick is secured in the bed-groove. The recesses 9 are providedwith a screwhole 11, which does not extend through the metal holder, butis only of sufficient depth to accommodate set-screws 12.

It will be observed that the strip 7 is slightly narrower than thegroove 6, and that the recesses are deeper than the thickness of theflange 5, that is, the recesses extend slightly into the base of thegroove 6, so that the strip 7 may project over the edge of the recesses,for the purpose of having the clamping plates engage this side of thestrip 7 in advance of their engagement with the face of the recess. Thisarrangement leaves a slight clearance between the flange 4c and thestrip 7, and when the plates are screwed into clamping position theyhold the strip against the abutting flange 4c and permit a slightexpansion of the strip under undue pressure of the knife. Thisarrangement of the clamping plates also permits the strip to be placedand removed by simply loosening the set-screws and without removing theplates therefrom or from the recesses.

While the invention is specially applicable to paper cutting machines,it may be employed in a like capacity on or in connection with othermachines having a reciproeating cutter or knife, the cutting edge ofwhich necessitates a bed-stick.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

l. A cutting stick for paper cutting machines, comprising a holderhaving side flanges forming a groove, a strip or bar fitting the groove,one of such flanges having slots, clamping plates fitting the slots, andmeans for operating the plates for clamping the strip against the otherflange.

2. In a cutting stick for paper cutting' machines, the combination, witha grooved holder having side slots and recesses, and a cutter-striploosely fitting the slot, of clamping plates operated in the recessesand through the slots to clamp the strip, and suitable set-screws foroperating the plates against the strip in advance of their being securedin the recesses.

3. In a cutting stick for paper cutting machines, the combination, witha holder having flanges forming a groove, one of said flanges havingslots extending from recesses in the side of the holder, and a cutterstrip fitting the groove with a clearance between it and the flanges, ofclamping plates oper ated in the recesses and through the slots forclamping the strip against the other of said flanges, and means forholding the plates in position.

4:. In a cutting stick for paper cutting machines, the combination, witha holder having a longitudinal groove and recesses in one side thereofbelow the groove, and slots extending from the recesses through one sideof the groove, and a cutter-strip for the groove, of means for clampingthe strip in the groove comprisingplates fitting the recesses, andset-screws for working the plates through the slots in a clampingoperation.

5. In a cutting stick for paper cutting machines, the combination, witha holder having a longitudinal groove and provided with recessesextending from one side of the holder into the base of the slot, slotsextending from the recesses through this side of the holder, and acutter-strip in the groove and overhanging the recesses, ofclamping-plates fitting the recesses, and setscrews extending throughthe plates and into the holder for operating the plates in the recessesand slots.

In witness whereof I hereunto set my hand in the presence of twowitnesses.

BRUCE MONROE HELM.

WVitnesses:

EDNA A. MCKENZIE, MARY BLACK.

